Question

If 2a+b=12 and ab=15 find value of 8a^3+b^3

Answer 1

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Answer 2

 8a^3+b^3
=(2a-3b)^3+(3*2a*3b*(2a-3b))
=(2a-3b)^3+18ab(2a-3b)
=3^3+18*2*3
=27+180
=135(ans)
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